The Boot ROM is factory-programmed with boot-loading software. Boot-mode signals (general purpose I/Os) are used to tell the bootloader software what mode to use on power up. The 281x Boot ROM also contains standard math tables, such as SIN/COS waveforms for use in IQ math related algorithms. This guide describes the purpose and features of the bootloader. It also describes other contents of the device on-chip boot ROM and identifies where all of the information is located within that memory.